More sleep in old age, however, is 50.____with better health, and most older people would feel better and more 51.____if they slept for longer periods, he said.
While elderly people 47.to sleep for fewer hours than they did when they were younger, this has a 48.effect on their brain's performance and they would benefit from getting more, according to research.
A.表示复数的语法是real+imagej
B.实部和虚部都是浮点数
C.虚部必须后缀j,且必须是小写
D.方法conjugate返回复数的共轭复数
指出下而论断中的错误(伯努利(Bernoulli)悖论):
命题:对于任意复数z≠0,∞,有.